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Planning of Green Space Ecological Network in Urban Areas: An Example of Nanchang, China.

Li H, Chen W, He W - Int J Environ Res Public Health (2015)

Bottom Line: The results indicated that: (1) compared to the green space system in 2005, the planned green space system in 2020 of the Nanchang urban area will decline in both districts (Changnan and Changbei districts).In other words, the planned green space system does not necessarily improve the present green space system; (2) the ecological network of two districts has high corridor density, while Changnan's ecological network has higher connectivity, but Changbei's ecological network is more viable from an economic point of view, since it has relatively higher cost efficiency; (3) decrease in patch density, Euclidean nearest neighbor distance, and an increase in mean patch size and connectivity implied that the ecological network could improve landscape connectivity greatly, as compared with the planned green space system.As a result, the quality of the urban ecological environment would be improved.

View Article: PubMed Central - PubMed

Affiliation: College of Land Resource and Environment, Jiangxi Agricultural University, Nanchang 330045, China. haifengl1984@jxau.edu.cn.

ABSTRACT
Green space plays an important role in sustainable urban development and ecology by virtue of multiple environmental, recreational, and economic benefits. Constructing an effective and harmonious urban ecological network and maintaining a sustainable living environment in response to rapid urbanization are the key issues required to be resolved by landscape planners. In this paper, Nanchang City, China was selected as a study area. Based on a series of landscape metrics, the landscape pattern analysis of the current (in 2005) and planned (in 2020) green space system were, respectively, conducted by using FRAGSTATS 3.3 software. Considering the actual situation of the Nanchang urban area, a "one river and two banks, north and south twin cities" ecological network was constructed by using network analysis. Moreover, the ecological network was assessed by using corridor structure analysis, and the improvement of an ecological network on the urban landscape was quantitatively assessed through a comparison between the ecological network and green space system planning. The results indicated that: (1) compared to the green space system in 2005, the planned green space system in 2020 of the Nanchang urban area will decline in both districts (Changnan and Changbei districts). Meanwhile, an increase in patch density and a decrease in mean patch size of green space patches at the landscape level implies the fragmentation of the urban green space landscape. In other words, the planned green space system does not necessarily improve the present green space system; (2) the ecological network of two districts has high corridor density, while Changnan's ecological network has higher connectivity, but Changbei's ecological network is more viable from an economic point of view, since it has relatively higher cost efficiency; (3) decrease in patch density, Euclidean nearest neighbor distance, and an increase in mean patch size and connectivity implied that the ecological network could improve landscape connectivity greatly, as compared with the planned green space system. That is to say, the planned ecological network would reduce landscape fragmentation, and increase the shape complexity of green space patches and landscape connectivity. As a result, the quality of the urban ecological environment would be improved.

No MeSH data available.


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Distribution of ecological nodes and corridors of the Nanchang urban area.
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ijerph-12-12889-f003: Distribution of ecological nodes and corridors of the Nanchang urban area.

Mentions: Within the green space planning framework, nodes refer to any discrete non-linear patch, while links are linear elements that are to be included in the ecological network plan. In other words, a planned ecological network is a graph consisting of patches and corridors [35]. The evaluation of green space networks includes analyses of patch and corridor characteristics and the connectivity [29,32]. The degrees of connectivity become indices for linkage of network elements analysis. Several indices have been developed for this purpose [45,46]. In this study, corridor density and corridor length were used for analysis, comparing features in 2005 with the planned results in 2020. The improvement of ecological networks on urban landscape was quantitatively assessed through a comparison between the ecological network planning and green space system plan (in 2020) for the Nanchang urban area. It is reported that a greenbelt with the width more than 30 m should be built against noise [47]. In this study, the corridors in the ecological network planning (Figure 3) were normalized and have been regarded as green space, the width of the corridors was assumed as 40 m. These corridors were subsequently overlaid on the urban green space system planning map, while the land use types, in addition, were combined into a single type, i.e., non-green fields (Figure 4). Furthermore, landscape metrics on the landscape level for the ecological network planning were calculated.


Planning of Green Space Ecological Network in Urban Areas: An Example of Nanchang, China.

Li H, Chen W, He W - Int J Environ Res Public Health (2015)

Distribution of ecological nodes and corridors of the Nanchang urban area.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4627006&req=5

ijerph-12-12889-f003: Distribution of ecological nodes and corridors of the Nanchang urban area.
Mentions: Within the green space planning framework, nodes refer to any discrete non-linear patch, while links are linear elements that are to be included in the ecological network plan. In other words, a planned ecological network is a graph consisting of patches and corridors [35]. The evaluation of green space networks includes analyses of patch and corridor characteristics and the connectivity [29,32]. The degrees of connectivity become indices for linkage of network elements analysis. Several indices have been developed for this purpose [45,46]. In this study, corridor density and corridor length were used for analysis, comparing features in 2005 with the planned results in 2020. The improvement of ecological networks on urban landscape was quantitatively assessed through a comparison between the ecological network planning and green space system plan (in 2020) for the Nanchang urban area. It is reported that a greenbelt with the width more than 30 m should be built against noise [47]. In this study, the corridors in the ecological network planning (Figure 3) were normalized and have been regarded as green space, the width of the corridors was assumed as 40 m. These corridors were subsequently overlaid on the urban green space system planning map, while the land use types, in addition, were combined into a single type, i.e., non-green fields (Figure 4). Furthermore, landscape metrics on the landscape level for the ecological network planning were calculated.

Bottom Line: The results indicated that: (1) compared to the green space system in 2005, the planned green space system in 2020 of the Nanchang urban area will decline in both districts (Changnan and Changbei districts).In other words, the planned green space system does not necessarily improve the present green space system; (2) the ecological network of two districts has high corridor density, while Changnan's ecological network has higher connectivity, but Changbei's ecological network is more viable from an economic point of view, since it has relatively higher cost efficiency; (3) decrease in patch density, Euclidean nearest neighbor distance, and an increase in mean patch size and connectivity implied that the ecological network could improve landscape connectivity greatly, as compared with the planned green space system.As a result, the quality of the urban ecological environment would be improved.

View Article: PubMed Central - PubMed

Affiliation: College of Land Resource and Environment, Jiangxi Agricultural University, Nanchang 330045, China. haifengl1984@jxau.edu.cn.

ABSTRACT
Green space plays an important role in sustainable urban development and ecology by virtue of multiple environmental, recreational, and economic benefits. Constructing an effective and harmonious urban ecological network and maintaining a sustainable living environment in response to rapid urbanization are the key issues required to be resolved by landscape planners. In this paper, Nanchang City, China was selected as a study area. Based on a series of landscape metrics, the landscape pattern analysis of the current (in 2005) and planned (in 2020) green space system were, respectively, conducted by using FRAGSTATS 3.3 software. Considering the actual situation of the Nanchang urban area, a "one river and two banks, north and south twin cities" ecological network was constructed by using network analysis. Moreover, the ecological network was assessed by using corridor structure analysis, and the improvement of an ecological network on the urban landscape was quantitatively assessed through a comparison between the ecological network and green space system planning. The results indicated that: (1) compared to the green space system in 2005, the planned green space system in 2020 of the Nanchang urban area will decline in both districts (Changnan and Changbei districts). Meanwhile, an increase in patch density and a decrease in mean patch size of green space patches at the landscape level implies the fragmentation of the urban green space landscape. In other words, the planned green space system does not necessarily improve the present green space system; (2) the ecological network of two districts has high corridor density, while Changnan's ecological network has higher connectivity, but Changbei's ecological network is more viable from an economic point of view, since it has relatively higher cost efficiency; (3) decrease in patch density, Euclidean nearest neighbor distance, and an increase in mean patch size and connectivity implied that the ecological network could improve landscape connectivity greatly, as compared with the planned green space system. That is to say, the planned ecological network would reduce landscape fragmentation, and increase the shape complexity of green space patches and landscape connectivity. As a result, the quality of the urban ecological environment would be improved.

No MeSH data available.


Related in: MedlinePlus